<script setup lang="ts">
import { getHotRecommendAPI } from '@/services/hot'
import { onLoad } from '@dcloudio/uni-app'
import { ref } from 'vue'
import type { SubTypeItem } from '@/types/hot'
// 热门推荐页 标题和url
const hotMap = [
  { type: '1', title: '特惠推荐', url: '/hot/preference' },
  { type: '2', title: '爆款推荐', url: '/hot/inVogue' },
  { type: '3', title: '一站买全', url: '/hot/oneStop' },
  { type: '4', title: '新鲜好物', url: '/hot/new' },
]
// 查询参数
const query = defineProps<{
  type: string
}>()
// 基于参数type查找相应的hot对象
const hot = hotMap.find((item) => item.type === query.type)!
// 动态设置导航栏标题
uni.setNavigationBarTitle({
  title: hot.title,
})

// 记录类型下标(当前是哪个tab)
const activeIndex = ref(0)
// 大图
const bannerPicture = ref('')
// 子类集合
const subTypes = ref<SubTypeItem[]>([])
// 获取热门推荐数据
const getHotRecommendData = async () => {
  const res = await getHotRecommendAPI(hot.url, {
    page: 32,
  })
  bannerPicture.value = res.bannerPicture
  subTypes.value = res.subTypes
}

onLoad(() => {
  getHotRecommendData()
})

// 滚动触底
const onScrollToLower = async () => {
  // 获取当前选项
  const currentSubType = subTypes.value[activeIndex.value]
  // 判断当前选项是否有更多数据了

  // 如果当前类型数据加载结束，提前结束
  if (currentSubType.isFinished) return
  // 当前页面大于等于总页码
  if (currentSubType.goodsItems.page >= currentSubType.goodsItems.pages) {
    // 没有更多数据了
    currentSubType.isFinished = true
    // 提示
    return uni.showToast({
      title: '没有更多数据了~',
      icon: 'none',
    })
  }
  // 发请求，获取新一页的数据
  const res = await getHotRecommendAPI(hot.url, {
    // 子类型id
    subType: currentSubType.id,
    // 页码自增
    page: ++currentSubType.goodsItems.page,
    // 每页条数
    pageSize: currentSubType.goodsItems.pageSize,
  })
  // 获取新一页的item数组
  const newitems = res.subTypes[activeIndex.value].goodsItems.items
  // 追加给当前类型的下items数组中
  currentSubType.goodsItems.items.push(...newitems)
}
</script>

<template>
  <view class="viewport">
    <!-- 推荐封面图 -->
    <view class="cover">
      <image :src="bannerPicture" />
    </view>
    <!-- 推荐选项 -->
    <view class="tabs">
      <text class="text" v-for="(item, index) in subTypes" :key="item.id" :class="{ active: index === activeIndex }"
        @tap="activeIndex = index">{{ item.title }}</text>
    </view>
    <!-- 推荐列表 -->
    <scroll-view scroll-y class="scroll-view" v-for="(item, index) in subTypes" :key="item.id"
      v-show="index === activeIndex" @scrolltolower="onScrollToLower">
      <view class="goods">
        <navigator hover-class="none" class="navigator" v-for="goods in item.goodsItems.items" :key="goods.id"
          :url="`/pages/goods/goods?id=${goods.id}`">
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view class="loading-text">{{
        item.isFinished ? '没有更多数据了~' : '正在加载...'
      }}</view>
    </scroll-view>
  </view>
</template>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}

.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}

.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}

.scroll-view {
  flex: 1;
}

.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;

  .text {
    margin: 0 20rpx;
    position: relative;
  }

  .active {
    &::after {
      content: '';
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}

.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;

  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }

  .thumb {
    width: 305rpx;
    height: 305rpx;
  }

  .name {
    height: 88rpx;
    font-size: 26rpx;
  }

  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }

  .symbol {
    font-size: 70%;
  }

  .decimal {
    font-size: 70%;
  }
}

.loading-text {
  text-align: center;
  font-size: 28rpx;
  color: #666;
  padding: 20rpx 0 50rpx;
}
</style>
